Effect of coating type on the mechanical performance of warp-knitted fabrics and cement-based composites

Abstract

High-performance textiles are used for reinforcing concrete structural parts. This paper presents a technique for producing coated weft-inserted warp-knitted fabrics for concrete applications. Three types of reinforced fabrics differing in coating type and composed of alkali-resistant-glass rovings resulting in a cement composite matrix were produced. The investigated coatings include potassium silicate, carboxylated styrene butadiene rubber and epoxide. The mechanical properties of the developed fabrics and cement composites were determined according to the coating type. Thereafter, the mechanical performance of the warp-knitted reinforced fabrics was investigated using tensile tests. Finally, the properties of the composites were examined according to the coating type using a four-point bending test. The results of the characterization of the coated weft-inserted warp-knitted reinforced fabrics and cement composites based on them are presented and discussed. It is shown that the coating material has high influence on the composite properties. Samples with potassium silicate showed highest strength at the limit of proportionality, while samples with epoxide showed the highest flexural strength.

Surface Modification of Glass Textile for the Reinforcement of a Cement-Based Composite: A Review

“…Indeed, the reduction of the mechanical performance of FRCM composites exposed to temperature over 80 • C was reported for epoxy pre-impregnated carbon fabrics [68]. In order to overcome this issue, some studies propose the application of inorganic coatings instead of polymer based coatings [63,[70][71][72][73][74][75][76][77][78]. Weichold at al.…”

“…The authors also report that large silica fume particles have a beneficial effect on the durability of the composite because of the pozzolanic reaction between the amorphous silica and the portlandite. Instead of silica fume particles Quadflieg et al, report the use of a potassium silicate dispersion for the impregnation of AR-glass fabric [71]. The inorganic coating was applied on the AR-glass fabric using a coating machine with roll-to-roll technique.…”

“…The pull-out results obtained after aging show that the best composite properties are obtained for the reinforcement coated with the epoxy resin dispersion. Quadflieg et al, investigated the effects of epoxy and styrene-butadiene impregnation among with the use of inorganic potassium silicate coating for the modification of AR-glass fabric [71]. Interestingly the authors use an automatic coating plant for the impregnation of the fabric, making some considerations on the process feasibility.…”

“…Table 1 schematizes the different techniques analyzed in this review and summarizes their effect on: the load distribution between the single filaments (stress-transfer), the interaction with the cementitious matrix and the effect on fibers durability (alkali-resistance). Increase of the composite tensile strength without loss of flexibility [71] Lower increase of the fabric tensile strength compared with epoxy coating [81] Fresh coating (f/f)…”

Off-Axis Flexural Properties of Multiaxis 3D Basalt Fiber Preform/Cementitious Concretes: Experimental Study

“…In addition, a 3D warp-knitted preform has been contemplated for employing in concrete structures [ 9 , 10 ]. Furthermore, several techniques, including pre-stressing, filament winding, pultrusion and hand lay-up were utilized for textile-reinforced concretes [ 11 , 12 , 13 ]. Many applications of textile-reinforced concretes were identified in civil engineering, including industrial floors, bridge decks, prefabricated panels and rehabilitation (connectors, jackets, confinement, wrapping, repairing, seismic retrofit and anchoring) [ 14 , 15 , 16 ].…”